Bekoff A, Sabichi A L
Department of EPO Biology, University of Colorado, Boulder 80309.
Dev Psychobiol. 1987 Sep;20(5):489-95. doi: 10.1002/dev.420200503.
Previous work shows that folding a posthatching chick into the hatching position results in the re-initiation of hatching. Furthermore, bending the neck to the right or left serves as a selective signal for turning on hatching behavior. The present study addresses the issue of whether sensory receptors located in the neck provide this signal. Three groups of chicks were folded into the hatching position and placed in glass eggs. In the experimental group, sensory input from the neck was eliminated with a local anesthetic, lidocaine. In these chicks, hatching was initiated only after a long latency, correlated with the time at which the anesthetic wore off. In the two control groups, in which saline was injected into the neck or lidocaine was injected into the thigh, the latency was much shorter. Therefore sensory receptors located in the neck appear to provide input that serves as a selective signal for initiating hatching.
先前的研究表明，将孵化后的雏鸡折叠成孵化姿势会导致孵化重新开始。此外，将颈部向右或向左弯曲是开启孵化行为的选择性信号。本研究探讨了位于颈部的感觉受体是否提供了这一信号。三组雏鸡被折叠成孵化姿势并放置在玻璃蛋中。在实验组中，用局部麻醉剂利多卡因消除颈部的感觉输入。在这些雏鸡中，孵化仅在很长的潜伏期后才开始，这与麻醉剂失效的时间相关。在两个对照组中，分别向颈部注射生理盐水或向大腿注射利多卡因，潜伏期要短得多。因此，位于颈部的感觉受体似乎提供了作为启动孵化的选择性信号的输入。
